Only upper half is composite - lower deck is wood.
And one problem I think with all of two level skates. High speed impact into the nose or tail during riders falls may make hydro strike and destroy wooden deck. Water working like a hard spike between upper and lower decks and I know few of two levels with the same demolition

Pretty durable. I've had one and it's held together well. You might want to take a look at the Mod or an Integrity deck. Those will last as well. Also head over to wakeskating.com There's more going on over there.